package cn.trs.common.utils;

import org.apache.commons.lang3.StringUtils;

import javax.servlet.http.HttpServletRequest;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.util.Enumeration;

/**
 * @version 1.0
 * @author:TRS
 * @create:2023/2/23 9:51
 * @description:
 * @ClassName: IpUtil
 * @company TRS
 */
public class IpUtil {
    private static String LocalHostIp = null;//本地IP地址


    /**
     * 获取用户真实IP地址，不使用request.getRemoteAddr();的原因是有可能用户使用了代理软件方式避免真实IP地址,
     *
     * 可是，如果通过了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP值，究竟哪个才是真正的用户端的真实IP呢？
     * 答案是取X-Forwarded-For中第一个非unknown的有效IP字符串。
     *
     * 如：X-Forwarded-For：192.168.1.110, 192.168.1.120, 192.168.1.130,
     * 192.168.1.100
     *
     * 用户真实IP为： 192.168.1.110
     *
     * @param request
     * @return
     */
    public static String getIpAddress(HttpServletRequest request) {
        String ip = request.getHeader("x-forwarded-for");
        if (!StringUtils.isBlank(ip)) {
            String ips[] = ip.split(",");
            for (int i = 0; i < ips.length; i++) {
                if (!StringUtils.isBlank(ips[i]) && !"unknown".equals(ips[i].trim())) {
                    ip = ips[i].trim();
                    break;
                }
            }
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_CLIENT_IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_X_FORWARDED_FOR");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
        }
        return ip;
    }
    //获取本机ip
    public static String getHostIp() {

        String sIP = "";
        InetAddress ip = null;
        try {
            boolean bFindIP = false;
            Enumeration<NetworkInterface> netInterfaces = NetworkInterface.getNetworkInterfaces();
            while (netInterfaces.hasMoreElements()) {
                if (bFindIP)
                    break;
                NetworkInterface ni = netInterfaces.nextElement();
                Enumeration<InetAddress> ips = ni.getInetAddresses();
                while (ips.hasMoreElements()) {
                    ip = ips.nextElement();
                    if (!ip.isLoopbackAddress()
                            && ip.getHostAddress().matches("(\\d{1,3}\\.){3}\\d{1,3}")) {
                        bFindIP = true;
                        break;
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        if (null != ip)
            sIP = ip.getHostAddress();
        return sIP;
    }
    public static String getStaticLocalHostIp(){
        if(StringUtils.isBlank(LocalHostIp)){
            LocalHostIp = getHostIp();
        }
        return LocalHostIp;
    }
    public static void main(String args[]){
        System.out.println(getHostIp());
    }
}
